99 CLK 320 P0410 P0450 Error Codes
 

I have a 99 CLK 320 with the check engine light on. I went to autozone and the codes were P0410 and P0450. The shop I took it to said they have to remove the heads and clean some tubes for about $3K. Is there anything else I can do or do I just have to bite the bullet?

Have some one look for an electrical connection that is corroded before spending any money on a big ticket item like cleaning "tubes"

My 99 320 has had a number of corrosion issues with connectors - none too expensive to fix, but hard to diagnose.